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  4. [Solved] Images in qt application not loading.

[Solved] Images in qt application not loading.

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  • J Offline
    J Offline
    joshua-anderson
    wrote on last edited by
    #9

    Good News! I followed your advice and use a absolute path when loading the image directly from disk and it works.

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    • J Offline
      J Offline
      joshua-anderson
      wrote on last edited by
      #10

      Wired. I can set the image just fine from a file absolute path (like c:\test.png) in the ui file, but when I try to set the image from file absoulte path from the qpixmap code like above, I am getting a null pixmap. Any clue why a pah that works in the ui file would not load in a QPixmap?

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #11

        Indeed it's strange.

        Try to open the file with QFile (at the same place you create the pixmap), see if it fails and what error you get

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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        • J Offline
          J Offline
          joshua-anderson
          wrote on last edited by
          #12

          If I use the code:
          @QFile testing("C:\test.png");
          qDebug() << testing.exists();@

          Where my qpixmap code is (for reference I have tried it in my constructor and my resizeEvent function) the console prints false, indicating that something is really screwed up. I am 100% certain this file exists as this path will load a image from the ui file.

          The following ui code:

          @<iconset><normaloff>C:\test.png</normaloff>C:\test.png</iconset>@

          displays the image correctly.

          Any tips on things I could have screwed up in my code that could cause such a weird thing?

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          • J Offline
            J Offline
            joshua-anderson
            wrote on last edited by
            #13

            Hello! If anyone is interested or willing to take a look at my code (it's not much) https://dl.dropboxusercontent.com/u/57778776/Working-Copy-Trackbox.zip
            I would really appreciate it. The code that is giving my problems is in trackboxmainwindow.cpp and is proceded by a large comment blocks. Thanks. I am so confused in the ways a exact path of a existing file can't be found by qt.

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            • musimbateM Offline
              musimbateM Offline
              musimbate
              wrote on last edited by
              #14

              Hi ,try this:
              1.Clean the whole project
              2.Run qmake
              3.Rebuild the whole project

              your problem sounds like "this":http://qt-project.org/forums/viewthread/28815/

              Hope this helps.

              Why join the navy if you can be a pirate?-Steve Jobs

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              • J Offline
                J Offline
                joshua-anderson
                wrote on last edited by
                #15

                I will try the clean advice(never a bad idea). This might be part of the problem with my issues in my reasources file, and this will hopefully fix it. Right now I am trying top figure out why qpixmapand qfile thinks a file with a direct path to disk does not exist when the same path works in qtcreator.

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #16

                  It's normal it's printing false. You're not escaping the \ in your code.

                  Anyway since you're using Qt, use the forward slash (yes, like unix) for your paths everywhere and you wont be hit again by this.

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  • J Offline
                    J Offline
                    joshua-anderson
                    wrote on last edited by
                    #17

                    Duh! I feel like a idiot for not noticing that. That should solve the loading image from disk problem. Next, to see if I can load from reasources.

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                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #18

                      If you have your images in a folder, don't forget to add it in your path

                      Interested in AI ? www.idiap.ch
                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                      • J Offline
                        J Offline
                        joshua-anderson
                        wrote on last edited by
                        #19

                        musimbate, Thank you so much for your advice. It solved my resource loading problem. Why must you be this way windows?!?

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                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #20

                          That's a question for Microsoft :D

                          Anyway, if you have everything working now, don't forget to update the thread title prepending [solved] so other forum users may know a solution has been found :)

                          Interested in AI ? www.idiap.ch
                          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                          • P Offline
                            P Offline
                            psteranka
                            wrote on last edited by
                            #21

                            I was running into a problem and it was as simple as running qmake and then re-building, and then viola it worked. I used

                            @
                            QFile testIt(":/images/mypict.jpg")
                            qDebug() << "Are you loading?: " << testIt.exists();
                            @

                            to verify that the image was NOT loading, but I didn't know why. I searched around for answers but didn't find one that said When you add a resource, you need to re-run qmake.

                            I'm posting this in case someone else has the same problem.

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                            • P Offline
                              P Offline
                              psteranka
                              wrote on last edited by
                              #22

                              I was running into a problem and it was as simple as running qmake and then re-building, and then viola it worked. I used

                              @
                              QFile testIt(":/images/mypict.jpg")
                              qDebug() << "Are you loading?: " << testIt.exists();
                              @

                              to verify that the image was NOT loading, but I didn't know why. I searched around for answers but didn't find one that said When you add a resource, you need to re-run qmake.

                              I'm posting this in case someone else has the same problem.

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                              0
                              • G Offline
                                G Offline
                                Gmoney
                                wrote on last edited by
                                #23

                                Is there any way to force Designer to use the full path of an icon by default?

                                R 1 Reply Last reply
                                0
                                • G Gmoney

                                  Is there any way to force Designer to use the full path of an icon by default?

                                  R Offline
                                  R Offline
                                  reena jaus
                                  wrote on last edited by
                                  #24

                                  @Gmoney just add image to ur .qrc file in qt . and then right click on the image copy full path . then u get the correct path
                                  paste that to ur code .it works

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